More data showing a recovery in the construction market: the price of lumber continues to increase. The increases tend to follow the fate of homebuilders, so it's not directly correlated with the health of the commercial construction industry. Homebuilders saw a steep ramp-up in business early in 2013 but cooled dramatically over the summer. But coupling this data with the AIA ABI, and all signs indicate an improving construction market.
Graph courtesy of Bill McBride at the Calculated Risk blog.